Just a quick thing that came to my attention recently; many are finding loop holes in the rules section as to what ghosting is - I can't remember off the top of my head what is written there but I don't think it encompasses props and/or hiding spots (even if dead on blue etc).
Again, usually lots of regulars on a server will give 'stern words' and usually ghosting will cease, I'm just mindful that you might not have regulars on the server to do this on some occasions.
The rule says not to give out locations of RED team members (besides your own spot) and some people think that makes it fine to say what prop people are, usually when it's down to one or two props.
I don't think it's a giant problem compared to giving out spots because I already know what props should and shouldn't be there for every map but I suppose it could help people who don't know what they're doing. However, I don't see it changing even if the rule is changed because not many people bother to read the rules.
Maybe if the server specific rules were added to the MOTD that appears on map start and the MOTD was forced for 3-5 seconds before it could be closed?